Correlation between microstructure and microhardness in a friction stir welded 2024 aluminium alloy

• DOI: 10.1016/j.scriptamat.2004.12.027
• Publication Date: 2005-01-25T14:49:35Z
• Authors: M JONES; P HEURTIER; C DESRAYAUD; F MONTHEILLET; D ALLEHAUX; J DRIVER
• Keywords: Friction stir welding; 0203 mechanical engineering; Hardness; TEM; Aluminium alloys; Precipitation; 02 engineering and technology; [SPI.MAT]Engineering Sciences [physics]/Materials; 620

Abstract A 2024-T351 aluminium alloy has been friction stir welded and the microstructures investigated. An inner HAZ hardness minimum was a result of an overaged S phase, whereas an outer minimum was believed to be due to precipitate dissolution. An interjacent HAZ maximum was attributable to the presence of very fine S phase precipitates. The nugget zone contained ∼4 μm grains and complex dislocation structures.